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Build intelligent multi-channel messaging into your applications with the Sent unified API. Send SMS and WhatsApp messages through a single interface with automatic routing, fallback, and cost optimization.

New to Sent?

Follow our structured learning path from understanding the platform to production deployment:

1. Why Sent?

Understand Sent's value proposition, use cases, and how we compare to alternatives.

2. Core Concepts

Learn the fundamentals: platform architecture, unified messaging, channels, contacts, and templates.

3. Quickstart

Get up and running: account setup, channel configuration, and send your first message.

Implementation Guides

Practical guides for building with Sent:

Sending Messages

Everything about sending messages: single, batch, scheduling, and retry strategies.

Status Tracking

Track delivery status via webhooks, polling, and the dashboard.

Managing Contacts

Create, update, and organize contacts with intelligent channel detection.

Working with Templates

Create and manage message templates across SMS and WhatsApp.

Batch Operations

Send messages in bulk and import contacts efficiently.

Error Handling

Handle errors gracefully with retries, circuit breakers, and best practices.

Webhooks & Events

Receive real-time notifications about your messages:

Getting Started

Configure your first webhook endpoint for message status updates.

Event Types

Complete reference for message and template webhook events.

Security

Verify webhook authenticity with HMAC-SHA256 signatures.

Production Checklist

Ensure your webhooks are production-ready with idempotency and error handling.

Advanced Topics

Deep dives for power users and enterprises:

Performance Optimization

Rate limiting, connection pooling, and high-throughput patterns.

Compliance & Regulations

GDPR, TCPA, and country-specific messaging compliance.

API v2 to v3 Migration

Migrate from legacy v2 API to the current v3 API.

Multi-Tenant Architectures

Patterns for platforms managing multiple customers.

Help & Reference

FAQ

Common questions and answers about Sent.

Troubleshooting

Common issues and step-by-step solutions.

API Reference

Complete API documentation with endpoints and data models.

Support

Get help from our developer support team.

Why Sent?

Intelligent Infrastructure: Sent acts as the decision layer between your application and messaging channels, automatically optimizing for cost, speed, and reliability.

Key Benefits:

Unified API for SMS and WhatsApp with consistent request/response formats
Automatic fallback when primary channels fail
Cost optimization through real-time intelligent routing
Built-in compliance for TCPA, GDPR, and regional regulations
Network intelligence that improves with scale

API v3 Highlights:

Simplified authentication with x-api-key header only
Request body uses to (recipients), template (object with id/name/parameters), and channel
Response envelope with success, data, error, and meta fields
Webhook events with flat structure (fields at top level, not nested in payload)
Test mode for testing without side effects

Ready to get started? Begin with Why Sent? or jump straight into the Quickstart.